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私は問題がどこにあるのか分かりませんが、徐々に境界を広げたいと思います。本当に助けに感謝します。border-style徐々にCSSを広げて
#green1 {
background-color: green;
width: 50%;
height: 10%;
float: right;
}
#green1:hover {
animation-name:border;
animation-duration:3s;}
@keyframes border {
0% {
border:0px;
border-style:none;}
15% { border:1px solid black; border-style:dotted;}
35% { border:2px solid black; border-style:dotted;}
50% { border:4px solid black; border-style:dotted;}
75% { border:6px solid black; border-style:dotted;}
100% { border:8px solid black; border-style:dotted;}}